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From: Jonathan Wakely <redi@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r9-9474] libstdc++: Define __cpp_lib_constexpr_string macro Date: Thu, 29 Apr 2021 11:14:11 +0000 (GMT) [thread overview] Message-ID: <20210429111411.BC2393A19001@sourceware.org> (raw) https://gcc.gnu.org/g:cd5a61a33f6223314b14ae1aa2eed09c20ef81e1 commit r9-9474-gcd5a61a33f6223314b14ae1aa2eed09c20ef81e1 Author: Jonathan Wakely <jwakely@redhat.com> Date: Wed Apr 28 15:56:04 2021 +0100 libstdc++: Define __cpp_lib_constexpr_string macro As noted in r11-1339-gb6ab9ecd550227684643b41e9e33a4d3466724d8 we define a non-standard __cpp_lib_constexpr_char_traits feature test macro to indicate support for P0426R1 and P1032R1. At some point last year the __cpp_lib_constexpr_string macro was retconned to indicate support for those papers. This adds the new macro (which we didn't previously define, because it referred to P0980R1 "Making std::string constexpr" which we don't support). libstdc++-v3/ChangeLog: * include/bits/basic_string.h (__cpp_lib_constexpr_string): Define. * include/std/version (__cpp_lib_constexpr_string): Define. * testsuite/21_strings/char_traits/requirements/constexpr_functions_c++17.cc: Check for __cpp_lib_constexpr_string. * testsuite/21_strings/char_traits/requirements/version.cc: New test. (cherry picked from commit 3da80ed7efd582575e7850a403ce693ec882d087) Diff: --- libstdc++-v3/include/bits/basic_string.h | 3 ++- libstdc++-v3/include/std/version | 1 + .../requirements/constexpr_functions_c++17.cc | 7 +++++++ .../21_strings/char_traits/requirements/version.cc | 16 ++++++++++++++++ 4 files changed, 26 insertions(+), 1 deletion(-) diff --git a/libstdc++-v3/include/bits/basic_string.h b/libstdc++-v3/include/bits/basic_string.h index cacc31a9aa9..fbca63bb3aa 100644 --- a/libstdc++-v3/include/bits/basic_string.h +++ b/libstdc++-v3/include/bits/basic_string.h @@ -48,11 +48,12 @@ # include <string_view> #endif - namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION +#define __cpp_lib_constexpr_string 201611L + #if _GLIBCXX_USE_CXX11_ABI _GLIBCXX_BEGIN_NAMESPACE_CXX11 /** diff --git a/libstdc++-v3/include/std/version b/libstdc++-v3/include/std/version index 0f704c054cf..51cc821558f 100644 --- a/libstdc++-v3/include/std/version +++ b/libstdc++-v3/include/std/version @@ -126,6 +126,7 @@ #define __cpp_lib_chrono 201611 #define __cpp_lib_clamp 201603 #define __cpp_lib_constexpr_char_traits 201611 +#define __cpp_lib_constexpr_string 201611L #define __cpp_lib_enable_shared_from_this 201603 #define __cpp_lib_execution 201902L // FIXME: should be 201603L #define __cpp_lib_filesystem 201703 diff --git a/libstdc++-v3/testsuite/21_strings/char_traits/requirements/constexpr_functions_c++17.cc b/libstdc++-v3/testsuite/21_strings/char_traits/requirements/constexpr_functions_c++17.cc index 92c301b1900..6dd181fd33c 100644 --- a/libstdc++-v3/testsuite/21_strings/char_traits/requirements/constexpr_functions_c++17.cc +++ b/libstdc++-v3/testsuite/21_strings/char_traits/requirements/constexpr_functions_c++17.cc @@ -73,6 +73,13 @@ template<typename CT> return true; } +#ifndef __cpp_lib_constexpr_string +# error Feature-test macro for constexpr char_traits is missing +#elif __cpp_lib_constexpr_string < 201611 +# error Feature-test macro for constexpr char_traits has the wrong value +#endif + +// We also provide this non-standard macro for P0426R1. #ifndef __cpp_lib_constexpr_char_traits # error Feature-test macro for constexpr char_traits is missing #elif __cpp_lib_constexpr_char_traits != 201611 diff --git a/libstdc++-v3/testsuite/21_strings/char_traits/requirements/version.cc b/libstdc++-v3/testsuite/21_strings/char_traits/requirements/version.cc new file mode 100644 index 00000000000..073fa36ab18 --- /dev/null +++ b/libstdc++-v3/testsuite/21_strings/char_traits/requirements/version.cc @@ -0,0 +1,16 @@ +// { dg-do compile { target c++17 } } + +#include <version> + +#ifndef __cpp_lib_constexpr_string +# error Feature-test macro for constexpr char_traits is missing in <version> +#elif __cpp_lib_constexpr_string < 201611 +# error Feature-test macro for constexpr char_traits has the wrong value in <version> +#endif + +// We also provide this non-standard macro for P0426R1 and P1032R1. +#ifndef __cpp_lib_constexpr_char_traits +# error Feature-test macro for constexpr char_traits is missing in <version> +#elif __cpp_lib_constexpr_char_traits != 201611 +# error Feature-test macro for constexpr char_traits has the wrong value in <version> +#endif
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